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Geostationary orbit determination for time synchronization using analytical dynamic models

机译：使用解析动力学模型确定用于时间同步的地球静止轨道

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摘要

A real time analytical orbit determination method has been developed for precision national time synchronization. The one-way time transfer technique via a geostationary TV satellite standard time and frequency signal (STFS) dissemination system was considered. The differential method was also applied for mitigating errors in geostationary satellite STFS dissemination system. Analytical dynamic orbit determination with extended Kalman filter (EKF) was implemented to improve differential mode STFS (DSTFS) service accuracy by acquiring better accuracy of a geostationary satellite position. The perturbation force models applied for satellite dynamics include the geopotential perturbation up to fifth degree and order harmonics, luni-solar perturbations, and solar radiation pressure. All of the perturbation effects were analyzed by secular, short, and long period variations for equinoctial orbit elements such as semimajor axis, eccentricity vector, inclination vector, and mean right ascension of the geostationary satellite. The reference stations for orbit determination were composed of four calibrated stations. Simulations were performed to evaluate the performance of real time analytical orbit determination in Korea. The simulation results demonstrated that it is possible to determine real time position of geostationary satellite with the accuracy of 300 m rms. This performance implies that the time accuracy is better than 25 ns all over the Korean peninsula. The real time analytical orbit determination method developed in this research can provide a reliable, extremely high accurate time synchronization service through setting up domestic-only benchmarks.
机译：已经开发了用于精确的国家时间同步的实时分析轨道确定方法。考虑了通过对地静止卫星电视标准时间和频率信号（STFS）传播系统的单向时间传输技术。差分方法还用于减轻对地静止卫星STFS传播系统中的误差。实施具有扩展卡尔曼滤波器（EKF）的分析性动态轨道确定，以通过获取对地静止卫星位置的更好精度来提高差模STFS（DSTFS）服务精度。应用于卫星动力学的微扰力模型包括高达五阶和阶次谐波的地势微扰，太阳单扰和太阳辐射压力。通过对等轨道轨道元素（如半长轴，偏心率矢量，倾角矢量和对地静止卫星的平均右上升）的长期，短期和长期变化分析了所有摄动效应。用于确定轨道的参考站由四个校准站组成。进行了仿真以评估韩国实时分析轨道确定的性能。仿真结果表明，有可能以300 m rms的精度确定对地静止卫星的实时位置。该性能表明，整个朝鲜半岛的时间精度均优于25 ns。通过建立国内基准，本研究开发的实时分析轨道确定方法可以提供可靠，极高精度的时间同步服务。

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